Granite-sawing machine



G. GREEN. GRANITE SAWING MACHINE.

No. 533,194. W Patented Janr 29 1895.

vy a M GEORGE GREEN, or conceal), NEW HAMPSHIRE.

G'RANITE-SAWING MACHINE.

SPECIFICATION forming. part of Letters Patent N 0. 533,194, dated January 29 1895.

Application filed. ..luly 21, 1892- SerialNo. 440,760- (No model.)

To ctZZ whom it may cancer-m Be it known that I, GEORGE GREEN, a citizen of the United States, residing at Concord, in the county of Merrimac and State of New Hampshire, have invented certain new and useful Improvements in Granite-Sawing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to power cutters for stone Work, the object being to reduce the cost in production of certain ornamental work by providing a machine adapted to do the greater portion of What would otherwise require to be done by hand.

The invention will be fully set forth in the following specification and claim,and clearly illustrated in the accompanying drawings, forming a part thereof, of which- Figure l. is a side elevation of the machine, Fig. 2. being a broken plan view of same. Fig. 3. is a detached View in perspective, showing a portion of the cutter shaft and several rotary cutters mounted thereon. Fig. 4. is an enlarged view showing the adjustable pivotal connection of the cutter-fra1ne with its supports. Fig. 5. represents a piece of stone for a cornice, on which dentils are to form partof its ornamentation ;-the dotted lines showing the portion of work to be done by hand tools. Fig. 6. is another view showing the block of stone after completion of the dentils.

Similar reference letters denote like parts.

A, is a piece of cornice stone having a right angled edge a, from which the dentils B, are formed. Heretotore, all such work has from necessity been accomplished wholly by hand tools, occupying much time and attended with considerable risk, as a single misguided motion of the chisel causing a false chip will invariable render the stone useless for its intended purpose.

By the use of my improved machine, the most risky portion of the work is accomplished with comparative safety and very much more quickly than it could be done by hand tools.

The vertical sides of the dentils, or similar work, are easily cut by the rotary cutters (J, of my machine.

chine, that part of the work requiring to be done by hand tools being indicated in the same view by dotted lines, and in "Fig. 6, is shown a similar piece of work from which those portions indicatedby dotted lines in Fig. 5, have been removed by hand tools and the work finished. The machine work of such a nature is easily cut by my improved method in ten or more feet lengths, and as theentire number of cuts are made simultaneously, whether the stone be one foot or ten feet in length.

The cutters O, are mounted upon a suitable shaft'D, and separated and secured in proper relative position by the collars E, which are clamped together by means of one or more nuts F, fitting a threaded portion d, of the shaft D, near itsends. These collars E, are varied in length according to the distance the cutters may require to be separated for a given class of work. The shaft D, is mounted in bearings g, secured to the side rails of a frame comprising said side rails G, and suitable braces g'and that end of said frame opposite to the shaft D, is pivotally connected to supports H, which in the drawings are shown to be secured to a horizontal timber I,

extending from oneto another of the heavy posts J, such as are seen in large stone sheds. The pivotal connection is preferably made adjustable so as to facilitate the perfect adjustment of the frame carrying the cutters, with the stone to be operated upon. For instance, the stones to be .ormanented may be very bulky and heavy, and thus require much handling in order that they may be placed exactly as they should be to receive the cutters, which are lowered down by means of ropes or chains K, attached to the braces 9, ready to do their work, but by rendering the pivotal connection capable of adjustment, the stone may be placed as nearly as possible in the required position, and the further adjustment be accomplished on the frame. To do this in a simple manner, I provide elongated openings 9 near one end of the rails G, to receive the shaft L, and to control the movement of said rails G, upon their pivotal shafts L, and maintain them at any desired position I provide the screws M having an integral collar on, through which the shafts L, pass;- the free end of the said screws passing through the iron yokes N, and provided at each side thereof with nuts 0, fitting the threads of said screw.

The shaft D, is driven by a spur gear P, meshing with a spur gear Q, mounted on a short shaft R, the latter being mounted upon one of the rails G, and on said shaft R, is also, mounted a tight and loose belt pulley SS', connected by a belt T, with a driving pulley U, mounted upon one of the shafts L, which may be driven by a pulley V and belt W, taking power from the main driving shaft of a building.

The cutters O, are adjusted to various work by substituting for the collars E, others of different length.

Having described my invention, what I claim is- In an ornamental stone cutting machine the combination of a frame pivoted at one end to suitable supports, a shaft mounted in bear- 1 in gs secured to the opposite end of said frame and provided with a threaded portion near each end, rotary cutters mounted upon said shaft between said threaded portions, a series of detachable collars mounted upon said shaft for separating said cutters, nuts fitting the threaded portions of said shaft for adjusting and tightening the cutters and collars, suitable driving mechanism, and means substantially as described whereby, in cases where the stone to be cut is too bulky to be readily moved for adjustment to the machine, the pivotal connections of said frame may be adjusted to bring the cutters into proper operative position.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE GREEN, Witnesses:

J. B. THURSTON, CHAs. G. REMICK. 

